Project Gutenberg - Audio eBooks Read by People lists eight different books by Sir Arthur Conan Doyle, all read by humans (much better than the terrible simulated voices of other Gutenberg entries). These will soon be parked on my iPod for consumption later.
For those of you with
curl installed, the following will fetch all 25 parts of The Adventures of Sherlock Holmes:
curl -o 'advsh32#1.mp3' -G 'http://gutenberg.net/etext05/advsh32[01-25].mp3'